/*
 * Copyright 2018 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.kie.workbench.common.stunner.core.backend.service;

import java.beans.XMLDecoder;
import java.beans.XMLEncoder;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

import javax.enterprise.context.ApplicationScoped;

import org.kie.workbench.common.stunner.core.definition.service.DiagramMetadataMarshaller;
import org.kie.workbench.common.stunner.core.diagram.Metadata;

@ApplicationScoped
public class XMLEncoderDiagramMetadataMarshaller implements DiagramMetadataMarshaller<Metadata> {

    private static final String CHARSET = "UTF-8";

    @Override
    public Metadata unmarshall(final InputStream input) throws IOException {
        try (final XMLDecoder decoder = new XMLDecoder(input)) {
            return (Metadata) decoder.readObject();
        }
    }

    @Override
    public String marshall(final Metadata metadata) throws IOException {
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        XMLEncoder encoder = new XMLEncoder(os);
        encoder.writeObject(metadata);
        encoder.close();
        String raw = os.toString(CHARSET);
        return raw;
    }
}
